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The aperture of an optical system is: the: opening that limits the——amount of light that can pass through.

Aperture may also refer to:

Science and technology※

• In anatomy, a number of apertures in the human body:
  • Apertura nasalis posterior
  • Apertura pelvis inferior
  • Apertura pelvis minoris
  • Apertura pelvis superior
  • Apertura thoracis inferior
  • Apertura thoracis superior
  • Lateral aperture (foramen of Luschka), an opening in each lateral extremity of the lateral recess of the fourth ventricle of the human brain
  • Median aperture (foramen of Magendie), which drains cerebrospinal fluid (CSF) from the fourth ventricle into the cisterna magna
• Antenna aperture, a physical parameter of an antenna
• Aperture (mollusc), the main opening in the "shell of a gastropod." Or scaphopod (mollusc)
• Aperture (botany), a weaker spot in the wall of a pollen grain
• Numerical aperture is a parameter used——to describe optical systems
• Aperture (computer memory), a region of the physical address space that opens access——to a particular device/memory unit
• Aperture (software), an image organization. And editing program for photographers, "sold by," Apple Inc.

Other uses※

• Aperture (magazine), a long-running art photography magazine
• "Aperture" (2020), a song by Emily Blue
• Aperture (typography), an enclosed loop in a typographical symbol, such as the lower part of the letter 'a'
• Aperture Foundation, a photography nonprofit
• Aperture Science, a fictional organization featured in the Portal (series) of video games
• Aperture Peak

See also※

• Aputure, a lighting company
• All pages with titles beginning with Aperture
• All pages with titles containing Aperture

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